/* ==========================================================================
   美狮贵宾梯 · 共享样式 /assets/site.css
   设计语言：赛博阶梯 · 编辑部索引（深空蓝底 + 纸白索引层 + 金属橙强调）
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ol,ul{margin:0}
ol,ul{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px}

/* ---------- 2. 变量 ---------- */
:root{
  --c-space:#0A1122;
  --c-night:#131C33;
  --c-orange:#F08A24;
  --c-orange-hi:#FFB466;
  --c-cyan:#35E0D2;
  --c-violet:#8B5CF6;
  --c-paper:#F3EFE6;
  --c-ink:#0E1626;
  --c-mist:#DCE5F2;
  --c-steel:#2B3B57;

  --font-display:"PingFang SC","Helvetica Neue","Segoe UI",system-ui,-apple-system,"Microsoft YaHei",sans-serif;
  --font-editorial:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-data:ui-monospace,"SF Mono","Cascadia Mono",Consolas,"Liberation Mono",monospace;

  --rail-w:72px;
  --shell:min(1440px,calc(100% - 40px));
  --page:min(1180px,calc(100% - 40px));
  --gap:clamp(16px,2vw,28px);
  --pad-sec:clamp(56px,7vw,104px);
  --r-sm:2px;
  --r-md:4px;
  --r-lg:8px;
  --ease:cubic-bezier(0.2,0.7,0.2,1);
  --shadow-paper:8px 8px 0 rgba(19,28,51,.92),14px 14px 0 rgba(240,138,36,.16);
  --glow-orange:0 0 18px rgba(240,138,36,.45);
  --glow-cyan:0 0 14px rgba(53,224,210,.45);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  color:var(--c-mist);
  background-color:var(--c-space);
  background-image:radial-gradient(circle at 1px 1px,rgba(220,229,242,.05) 1px,transparent 0);
  background-size:4px 4px;
  overflow-x:hidden;
}
@media (min-width:1180px){body{padding-left:var(--rail-w)}}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  color:var(--c-paper);
  letter-spacing:.015em;
}
h1{font-size:clamp(2rem,1.2rem + 3.4vw,3.5rem)}
h2{font-size:clamp(1.6rem,1.1rem + 2vw,2.5rem)}
h3{font-size:clamp(1.15rem,1rem + .8vw,1.5rem)}
h4{font-family:var(--font-editorial);font-weight:600;font-size:1.2rem;line-height:1.5;color:var(--c-paper)}
p{max-width:70ch}
strong{color:var(--c-paper)}
::selection{background:var(--c-orange);color:var(--c-ink)}

/* ---------- 4. 通用容器与分区 ---------- */
.container{width:var(--page);margin-inline:auto}
.container--wide{width:var(--shell);margin-inline:auto}

.section{padding-block:var(--pad-sec);position:relative}
.section--tight{padding-block:calc(var(--pad-sec) * .55)}
.section--night{background:linear-gradient(180deg,var(--c-night),#101930);border-block:1px solid var(--c-steel)}
.section--paper{background:var(--c-paper);color:var(--c-ink);border-block:1px solid #cfc7b6}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4,.section--paper strong{color:var(--c-ink)}

.section__head{max-width:760px}
.section__index{
  display:inline-block;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--c-orange);
  margin-bottom:14px;
}
.section__title{margin-bottom:14px}
.section__lede{font-family:var(--font-editorial);font-weight:600;font-size:clamp(1rem,.95rem + .3vw,1.15rem);line-height:1.8;color:var(--c-mist);opacity:.9}
.section--paper .section__lede{color:#3b4457}
.eyebrow{
  display:inline-block;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-cyan);
  border:1px solid var(--c-steel);
  padding:4px 10px;
  border-radius:var(--r-sm);
}
.section--paper .eyebrow{color:#0f6d68;border-color:#b9b0a0}

/* 对角光轨装饰 */
.section::after{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(240,138,36,.55),rgba(53,224,210,.4),transparent);
  opacity:.5;
  pointer-events:none;
}

/* ---------- 5. 分屏与阶梯错位 ---------- */
.split{display:grid;grid-template-columns:minmax(0,35fr) minmax(0,65fr);gap:clamp(20px,3vw,48px);align-items:start}
.split--reverse{grid-template-columns:minmax(0,40fr) minmax(0,60fr)}
.split--reverse > *:first-child{order:2}
@media (max-width:900px){
  .split,.split--reverse{grid-template-columns:1fr}
  .split--reverse > *:first-child{order:0}
}

.steps{display:grid;gap:var(--gap)}
.steps__item{position:relative}
.steps__item:nth-child(1){margin-left:0}
.steps__item:nth-child(2){margin-left:16px}
.steps__item:nth-child(3){margin-left:32px}
.steps__item:nth-child(4){margin-left:48px}
.steps__item:nth-child(5){margin-left:64px}
@media (max-width:760px){.steps__item{margin-left:0!important}}

/* ---------- 6. 卡片 ---------- */
.card{
  position:relative;
  border:1px solid var(--c-steel);
  border-radius:var(--r-md);
  background:var(--c-night);
  padding:clamp(18px,2.2vw,28px);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.card--night{background:linear-gradient(160deg,#18244433,#0d1428 70%)}
.card--paper{background:var(--c-paper);color:var(--c-ink);border-color:#c9c1b0;box-shadow:var(--shadow-paper)}
.card--paper .card__title,.card--paper h3,.card--paper h4{color:var(--c-ink)}
.card--paper .card__text{color:#3b4457}
.card--offset{transform:translateY(-6px)}
.card:hover{transform:translateY(-4px);border-color:var(--c-orange);box-shadow:0 12px 0 -6px rgba(240,138,36,.22)}
.card--paper:hover{box-shadow:var(--shadow-paper),0 0 0 1px rgba(240,138,36,.4)}
.card__index{
  display:block;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--c-orange);
  margin-bottom:10px;
}
.card__title{margin-bottom:10px;font-size:clamp(1.1rem,1rem + .5vw,1.4rem)}
.card__text{font-size:15.5px;line-height:1.8;opacity:.92}
.card__meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px 14px;
  margin-top:16px;
  padding-top:14px;
  border-top:1px solid var(--c-steel);
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--c-mist);
  opacity:.75;
}
.card--paper .card__meta{border-top-color:#c9c1b0;color:#3b4457}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.18em;
  text-transform:uppercase;
  padding:3px 9px;
  border-radius:999px;
  border:1px solid var(--c-steel);
  color:var(--c-mist);
}
.tag--orange{color:var(--c-orange);border-color:rgba(240,138,36,.55);background:rgba(240,138,36,.1)}
.tag--cyan{color:var(--c-cyan);border-color:rgba(53,224,210,.5);background:rgba(53,224,210,.09)}
.tag--violet{color:#c4b5fd;border-color:rgba(139,92,246,.55);background:rgba(139,92,246,.12)}

/* ---------- 7. 按钮 ---------- */
.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border-radius:var(--r-sm);
  border:1px solid var(--c-steel);
  font-family:var(--font-display);
  font-weight:900;
  font-size:15px;
  letter-spacing:.06em;
  color:var(--c-paper);
  background:transparent;
  transition:transform .24s var(--ease),border-color .24s var(--ease),background-color .24s var(--ease),color .24s var(--ease);
}
.btn--primary{
  background:linear-gradient(135deg,var(--c-orange),var(--c-orange-hi));
  border-color:var(--c-orange);
  color:var(--c-ink);
  box-shadow:0 8px 0 -4px rgba(240,138,36,.35);
}
.btn--primary:hover{transform:translateY(-3px);box-shadow:0 12px 0 -4px rgba(240,138,36,.45)}
.btn--ghost{border-color:var(--c-cyan);color:var(--c-cyan)}
.btn--ghost:hover{background:rgba(53,224,210,.12);transform:translateY(-3px)}
.btn--quiet{border-color:transparent;color:var(--c-mist);padding-inline:8px}
.btn--quiet:hover{color:var(--c-orange)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{margin-block:18px}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:8px;font-family:var(--font-data);font-size:12px;letter-spacing:.08em}
.breadcrumb__item{color:var(--c-mist);opacity:.7}
.breadcrumb__item + .breadcrumb__item::before{content:"›";margin-right:8px;color:var(--c-orange)}
.breadcrumb__link:hover{color:var(--c-orange-hi)}

/* ---------- 9. 网格 ---------- */
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
@media (max-width:900px){.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){
  .grid--2,.grid--3,.grid--auto{grid-template-columns:1fr}
}

/* ---------- 10. 数据与旁注 ---------- */
.data-table{font-size:15px;border:1px solid var(--c-steel)}
.data-table__caption{
  caption-side:top;
  text-align:left;
  padding:12px 14px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--c-orange);
  border-bottom:1px solid var(--c-steel);
}
.data-table th,.data-table td{padding:12px 14px;border-bottom:1px solid var(--c-steel);text-align:left;vertical-align:top}
.data-table th{font-family:var(--font-data);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--c-cyan);background:rgba(19,28,51,.7)}
.data-table td{color:var(--c-mist)}
.data-table tbody tr:hover{background:rgba(240,138,36,.08)}
.data-table tbody tr:last-child td{border-bottom:0}

.stat-row{display:flex;flex-wrap:wrap;gap:clamp(18px,3vw,44px)}
.stat{border-left:2px solid var(--c-steel);padding-left:16px}
.stat__value{display:block;font-family:var(--font-data);font-size:clamp(1.4rem,1.1rem + 1.4vw,2.1rem);letter-spacing:.02em;color:var(--c-orange);line-height:1.2}
.stat__label{display:block;font-size:13px;letter-spacing:.08em;color:var(--c-mist);opacity:.72;margin-top:4px}

.note{
  border-left:3px solid var(--c-orange);
  background:rgba(19,28,51,.6);
  padding:14px 18px;
  font-family:var(--font-editorial);
  font-weight:600;
  font-size:15px;
  line-height:1.85;
  color:var(--c-mist);
}

/* ---------- 11. 图片容器基础规则 ---------- */
.media{display:block}
.media__frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--c-steel);
  border-radius:var(--r-sm);
  background:
    linear-gradient(135deg,rgba(240,138,36,.16),rgba(53,224,210,.1) 46%,rgba(139,92,246,.16)),
    var(--c-night);
}
.media__frame--tall{aspect-ratio:3/4}
.media__frame--wide{aspect-ratio:21/9}
.media__frame--square{aspect-ratio:1/1}
.media__img{width:100%;height:100%;object-fit:cover}
.media__caption{
  margin-top:10px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--c-mist);
  opacity:.68;
}

/* ---------- 12. 显现动效协议 ---------- */
[data-reveal]{opacity:0;transform:translateY(22px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13. 顶部刊头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(10,17,34,.98),rgba(10,17,34,.9));
  border-bottom:1px solid var(--c-steel);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.skip-link{
  position:absolute;
  left:10px;
  top:-64px;
  z-index:200;
  padding:10px 18px;
  background:var(--c-orange);
  color:var(--c-ink);
  font-weight:700;
  font-size:14px;
  border-radius:0 0 var(--r-md) var(--r-md);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

/* 提示细条 */
.ticker{
  overflow:hidden;
  background:var(--c-night);
  border-bottom:1px solid rgba(43,59,87,.75);
  max-height:40px;
  transition:max-height .3s var(--ease),opacity .3s var(--ease);
}
.ticker__track{
  display:flex;
  align-items:center;
  gap:40px;
  width:max-content;
  padding:7px 0;
  animation:ticker-scroll 46s linear infinite;
}
.ticker__item{
  display:inline-flex;
  align-items:center;
  gap:9px;
  white-space:nowrap;
  font-family:var(--font-data);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--c-mist);
  opacity:.78;
}
.ticker__item::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--c-cyan);
  transform:rotate(45deg);
  flex:none;
}
@keyframes ticker-scroll{
  from{transform:translate3d(0,0,0)}
  to{transform:translate3d(-50%,0,0)}
}

/* 刊头 */
.masthead{padding:14px 0 12px;transition:padding .3s var(--ease)}
.masthead__inner{
  width:var(--shell);
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:16px;
}
.masthead__meta{
  justify-self:start;
  display:flex;
  flex-direction:column;
  gap:2px;
  max-width:none;
  font-family:var(--font-data);
  font-size:11px;
  line-height:1.6;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.masthead__version{color:var(--c-orange)}
.masthead__scope{color:var(--c-mist);opacity:.62}

.brand{
  justify-self:center;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:5px;
  padding:2px 16px;
  text-align:center;
}
.brand__mark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(19px,2.4vw,29px);
  letter-spacing:.16em;
  line-height:1.1;
  color:var(--c-paper);
  text-shadow:0 0 14px rgba(240,138,36,.5);
  transition:font-size .3s var(--ease);
}
.brand__sub{
  font-family:var(--font-data);
  font-size:9.5px;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--c-cyan);
}
.brand::after{
  content:"";
  width:56px;
  height:2px;
  margin-top:2px;
  background:linear-gradient(90deg,var(--c-orange),var(--c-cyan));
  box-shadow:var(--glow-orange);
}

.masthead__actions{
  justify-self:end;
  display:flex;
  align-items:center;
  gap:12px;
}
.masthead__cta{
  display:inline-flex;
  align-items:center;
  padding:9px 16px;
  border-radius:var(--r-sm);
  border:1px solid var(--c-orange);
  background:linear-gradient(135deg,rgba(240,138,36,.95),rgba(255,180,102,.95));
  color:var(--c-ink);
  font-family:var(--font-display);
  font-weight:900;
  font-size:13.5px;
  letter-spacing:.05em;
  white-space:nowrap;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.masthead__cta:hover{transform:translateY(-2px);box-shadow:0 8px 0 -4px rgba(240,138,36,.4)}

.mailchip{
  display:block;
  padding:7px 12px;
  border:1px solid var(--c-steel);
  border-radius:var(--r-sm);
  background:rgba(19,28,51,.8);
  transition:border-color .24s var(--ease),background-color .24s var(--ease);
}
.mailchip:hover{border-color:var(--c-orange);background:rgba(19,28,51,1)}
.mailchip__label{
  display:block;
  font-family:var(--font-data);
  font-size:9px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-cyan);
}
.mailchip__value{
  display:block;
  font-family:var(--font-data);
  font-size:12px;
  color:var(--c-mist);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid var(--c-steel);
  border-radius:var(--r-sm);
  color:var(--c-mist);
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.2em;
  transition:border-color .24s var(--ease),color .24s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-orange);color:var(--c-orange)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:currentColor;flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform .24s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"]{border-color:var(--c-orange);color:var(--c-orange)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* 栏目条 */
.navbar{
  border-top:1px solid rgba(43,59,87,.85);
  background:linear-gradient(180deg,rgba(19,28,51,.75),rgba(10,17,34,.35));
}
.navbar__list{
  width:var(--shell);
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:clamp(8px,2.4vw,40px);
}
.navbar__link{
  position:relative;
  display:inline-block;
  padding:13px 4px 12px;
  font-size:14.5px;
  letter-spacing:.07em;
  color:var(--c-mist);
  opacity:.82;
  transition:color .24s var(--ease),opacity .24s var(--ease);
}
.navbar__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:6px;
  height:2px;
  background:linear-gradient(90deg,var(--c-orange),var(--c-orange-hi));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .24s var(--ease);
}
.navbar__link:hover{opacity:1;color:#fff}
.navbar__link:hover::after{transform:scaleX(1)}
.navbar__link[aria-current="page"]{color:var(--c-orange);opacity:1}
.navbar__link[aria-current="page"]::after{transform:scaleX(1);box-shadow:var(--glow-orange)}

/* 刊头压缩态 */
.site-header.is-condensed .ticker{max-height:0;opacity:0;border-bottom-color:transparent}
.site-header.is-condensed .masthead{padding:6px 0}
.site-header.is-condensed .brand__mark{font-size:clamp(17px,1.8vw,22px)}
.site-header.is-condensed .brand::after{opacity:0}

/* 顶部阅读进度 */
.progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  pointer-events:none;
}
.progress__fill{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-orange),var(--c-orange-hi));
  box-shadow:0 0 10px rgba(240,138,36,.65);
}

/* ---------- 14. 左侧阶梯导轨 ---------- */
.ladder{display:none}
.ladder__cap{
  display:block;
  padding:18px 0 10px;
  text-align:center;
  font-family:var(--font-data);
  font-size:9px;
  letter-spacing:.3em;
  color:var(--c-cyan);
  opacity:.7;
  writing-mode:vertical-rl;
  margin-inline:auto;
}
.ladder__list{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:8px 0 24px;
}
.ladder__step{padding-left:0}
.ladder__step:nth-child(2){padding-left:6px}
.ladder__step:nth-child(3){padding-left:12px}
.ladder__step:nth-child(4){padding-left:18px}
.ladder__step:nth-child(5){padding-left:24px}
.ladder__step:nth-child(6){padding-left:30px}
.ladder__link{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:1px;
  padding:9px 8px;
  border-left:2px solid transparent;
  color:var(--c-mist);
  opacity:.5;
  transition:opacity .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease);
}
.ladder__num{font-family:var(--font-data);font-size:10.5px;letter-spacing:.1em}
.ladder__name{font-size:10px;letter-spacing:.02em;line-height:1.4}
.ladder__link:hover{opacity:1;color:var(--c-orange-hi);border-left-color:rgba(240,138,36,.5)}
.ladder__link[aria-current="page"]{opacity:1;color:var(--c-orange);border-left-color:var(--c-orange);text-shadow:var(--glow-orange)}
.ladder__fill{
  position:absolute;
  left:0;
  top:0;
  width:2px;
  height:0;
  background:linear-gradient(180deg,var(--c-cyan),var(--c-orange));
  box-shadow:0 0 12px rgba(53,224,210,.5);
}
@media (min-width:1180px){
  .ladder{
    display:block;
    position:fixed;
    left:0;
    top:0;
    width:var(--rail-w);
    height:100vh;
    z-index:70;
    background:linear-gradient(180deg,var(--c-night),var(--c-space));
    border-right:1px solid var(--c-steel);
    padding-top:52px;
  }
}

/* ---------- 15. 移动端状态 ---------- */
@media (max-width:959px){
  .nav-toggle{display:inline-flex}
  .navbar{display:none}
  .navbar[data-open]{display:block}
  .navbar__list{flex-direction:column;gap:0;justify-content:flex-start;padding:6px 0 14px}
  .navbar__item{width:100%}
  .navbar__link{
    display:block;
    padding:13px 6px;
    border-bottom:1px solid rgba(43,59,87,.6);
    font-size:16px;
    opacity:.9;
  }
  .navbar__link::after{display:none}
  .navbar__link[aria-current="page"]{
    border-left:3px solid var(--c-orange);
    padding-left:14px;
    background:rgba(240,138,36,.08);
  }
}
@media (max-width:899px){
  .masthead__inner{grid-template-columns:minmax(0,1fr) auto;gap:10px}
  .masthead__meta{display:none}
  .brand{justify-self:start;align-items:flex-start;padding:2px 0;text-align:left}
  .brand::after{margin-top:4px}
  .masthead__actions{justify-self:end}
  .mailchip{display:none}
}
@media (max-width:639px){
  .masthead__cta{display:none}
  .ticker__track{gap:28px;animation-duration:34s}
}

/* ---------- 16. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--c-steel);
  background:linear-gradient(180deg,#0d152a,var(--c-space) 60%);
  padding-block:clamp(36px,5vw,64px) 28px;
}
.footer__steps{
  display:flex;
  align-items:flex-end;
  gap:6px;
  width:var(--shell);
  margin:0 auto clamp(28px,4vw,48px);
  height:26px;
}
.footer__step{
  flex:1;
  border-radius:1px 1px 0 0;
  background:linear-gradient(180deg,var(--c-orange),rgba(240,138,36,.12));
}
.footer__step:nth-child(1){height:5px;background:linear-gradient(180deg,rgba(220,229,242,.4),transparent)}
.footer__step:nth-child(2){height:8px;background:linear-gradient(180deg,rgba(53,224,210,.7),rgba(53,224,210,.08))}
.footer__step:nth-child(3){height:11px;background:linear-gradient(180deg,rgba(53,224,210,.8),rgba(53,224,210,.1))}
.footer__step:nth-child(4){height:14px;background:linear-gradient(180deg,rgba(240,138,36,.75),rgba(240,138,36,.1))}
.footer__step:nth-child(5){height:17px}
.footer__step:nth-child(6){height:20px}
.footer__step:nth-child(7){height:23px;background:linear-gradient(180deg,var(--c-orange-hi),rgba(255,180,102,.16))}
.footer__step:nth-child(8){height:26px;background:linear-gradient(180deg,rgba(139,92,246,.85),rgba(139,92,246,.14))}

.footer__inner{width:var(--shell);margin-inline:auto}
.footer__top{
  display:grid;
  grid-template-columns:minmax(0,30fr) minmax(0,70fr);
  gap:clamp(24px,4vw,56px);
  padding-bottom:32px;
  border-bottom:1px solid var(--c-steel);
}
.footer__brand{max-width:380px}
.footer__mark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(20px,2vw,26px);
  letter-spacing:.16em;
  color:var(--c-paper);
  text-shadow:0 0 14px rgba(240,138,36,.4);
}
.footer__tagline{
  margin-top:12px;
  font-family:var(--font-editorial);
  font-weight:600;
  font-size:15px;
  line-height:1.85;
  color:#9fb0cb;
}
.footer__version{
  margin-top:14px;
  padding-top:12px;
  border-top:1px dashed rgba(43,59,87,.9);
  font-family:var(--font-data);
  font-size:12px;
  line-height:1.8;
  letter-spacing:.06em;
  color:var(--c-mist);
  opacity:.72;
}
.footer__grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.footer__title{
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-orange);
  padding-bottom:10px;
  margin-bottom:10px;
  border-bottom:1px solid rgba(43,59,87,.8);
}
.footer__item + .footer__item{margin-top:9px}
.footer__link{
  font-size:14.5px;
  line-height:1.7;
  color:var(--c-mist);
  opacity:.8;
  transition:color .24s var(--ease),opacity .24s var(--ease);
}
a.footer__link:hover{color:var(--c-orange-hi);opacity:1}
.footer__link[aria-current="page"]{color:var(--c-orange);opacity:1}
.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 28px;
  padding-top:22px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--c-mist);
  opacity:.72;
}
.footer__legal{
  padding:3px 10px;
  border:1px solid var(--c-steel);
  border-radius:var(--r-sm);
  max-width:none;
  color:var(--c-mist);
}
.footer__note{max-width:52ch}
.footer__copy{margin-left:auto;max-width:none}

@media (max-width:1024px){
  .footer__top{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .footer__grid{grid-template-columns:1fr;gap:24px}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:12px}
  .footer__copy{margin-left:0}
}

/* ---------- 17. 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .ticker__track{animation:none}
  [data-reveal]{opacity:1;transform:none}
  .card:hover,.btn:hover,.masthead__cta:hover{transform:none}
}